One thing I thought I should point out about the PSI-Unit: Although they're all quite young, the Unit has been in existence for a while now, protecting La Perdita from any and all threats, mostly external ones. Of course, the island is a fairly peaceful one (or was, before the MBL got here... [mwah hwah haa] ), so it's somewhat true that they haven't really "gone public" all that much. But the public IS very well aware of their existence. They've been around longer than the Revolutionaries have been.